積立

1. Origins, structure, and basic meaning

• Structure: 積立 (つみたて) is a noun for installment savings or a plan of setting aside money regularly for a future purpose.
• Basic usage: It describes monthly contributions toward camp costs or creating a savings plan for a trip.
  • 部員は合宿費の積立として毎月少しずつ預けています。 — Members contribute a little each month toward the camp costs.
  • 授業で架空の旅行に向けた積立計画を作りました。 — In class, we created a savings plan for a fictional trip.

2. Common pitfalls and similar expressions

• One deposit and installment saving
  • 積立 focuses on accumulating small amounts repeatedly for a goal, while 積立計画 specifies the plan for that saving.